Notice: The microphone is very sensitive, do not drop, knock, or strong shock. If the microphone is placed next to the speaker, it may produce whistlers if happened, is about to place the microphone is far away from the speaker, or reduce the volume of the speaker. The tape change pick up mode switch settings, can produce noise. The battery indicator on the microphone when opening the lights up and immediately went out to save battery power and prevent stray light effects video. So please check the switch to confirm that the switch has been closed and the microphone is used when you do not use or stop using it. Plenty of battery, the battery indicator on the power switch when one flash, in use process, if the microphone or turn on the power switch, power light bright, this suggest that the battery is not enough, but still can be used one to two hours, but at this time, please replace the battery in time. Product Name: Microphone For Camera Model: MIC-01 Length of Cable: About 20cm Frequency Response: 30-15000 Hz Sensitivity: -40 dB (0dB = 1 V/Pa at 1 KHZ) Pointing To The Features: Single Directional x 2 Output Impedance: 200 Ohm Signal-to-noise Radio: 76 dB (1 KHZ at 1 PA) The Loudest Level: 120 dB at 1 KHZ harmonic distortion in 1% or less) Power Supply: 3V DC Type: MS (Mid-Side) Stereo Wire Power Requirements: 3V CR2 battery Battery Life: About 800 Hours (at room temperature, the use of packing attached 3V CR2 lithium battery) Compatible Model: It fits for any other D-SLR camera which have 3.5mm MIC socket and standard hot shoe How To Use: 1.Attachments will slide adapter to connect to the camera fixed on the slide rail microphone. 2.After confirm the camera closed, connected to the micphone L mini stereo plug the camera microphone input port. size:132x30.5x61mm Material:ABS colour:Black Package Contents: 1 x Microphone (The camera isn't included, it's for show only.) 1 x Battery 1 x User Manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.